A kind of preparation method of silicone rubber composite hollow fiber membrane
A fiber membrane and silicone rubber technology, which is applied in the field of preparation of silicone rubber composite hollow fiber membranes, can solve the problems of poor interaction between organic layers and inorganic particles, uneven dispersion of inorganic particles, poor film-forming properties, and poor mechanical properties. The effect of improving mechanical strength and toughness, increasing hydrophobicity, and improving dispersion performance
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Embodiment 1
[0015] (1) Preparation of hydrophobically modified nano-calcium carbonate: add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 90°C for 2 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess oil Acid, placed in a vacuum oven at 80°C, dried, and ground to obtain hydrophobically modified nano-calcium carbonate
[0016] (2) Preparation of silicone rubber casting solution: dissolve 10g of polydimethylsiloxane in n-hexane, stir well, add 0.05g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 0.5g of tetraethyl orthosilicate and mix Stir for 2 hours, then add 0.1g of dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 10wt%, stir at room temperature for 8 hours, centrifuge and defoam to make a casting solution ;
[0017] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral p...
Embodiment 2
[0020] (1) Preparation of hydrophobically modified nano-calcium carbonate: Add the dried nano-calcium carbonate to stearic acid under stirring conditions, stir and react at 70°C for 8 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess Stearic acid is dried in a vacuum oven at 80°C, and ground to obtain hydrophobically modified nano-calcium carbonate;
[0021] (2) Preparation of silicone rubber composite film: Dissolve 10g of polydimethylsiloxane in n-hexane, stir evenly, add 1g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 0.8g of phenyltriethoxysilane and mix Stir for 1 hour, then add 0.3g of dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 20wt%, stir at room temperature for 10 hours, centrifuge and defoam to make a casting solution ;
[0022] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral polyte...
Embodiment 3
[0025] (1) Preparation of hydrophobically modified nano-calcium carbonate: add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 80°C for 4 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess oil acid, placed in a vacuum oven at 80°C to dry, and ground to obtain hydrophobically modified nano-calcium carbonate;
[0026] (2) Preparation of silicone rubber composite film: Dissolve 10 g of polydimethylsiloxane in n-hexane, stir evenly, add 3 g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 1 g of tetraethyl orthosilicate, mix and stir for 0.5 hours , then add 0.5g dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 40wt%, stir at room temperature for 8 hours, centrifuge and defoam to make a casting solution;
[0027] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral polya...
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